Facebook Application Setup

Active member

I may be daft, but, I'm having trouble finding documentation on how to set up the application itself for use with Facebook. It's not just for logging in, right? You can have people like things on your forum and have it show up on facebook, correct?

I'm looking at all the settings on facebook, and I don't quite get what I'm supposed to be doing, or how to get things started. I can't "submit" my application until it has users, and I thought submit meant "finalize" it. I've put my Application ID and my Secret into the XenForo settings, but, I imagine there are facebook settings I'd need to put in that are specific to being used with XenForo.

I'd appreciate any help, and again, I apologize if this is somewhere obvious and I've overlooked it. (I overlooked the importer earlier yesterday >.<)